package servlet;

import pojo.User;
import service.UserService;
import service.impl.UserServiceImpl;
import utils.Page;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

// 注解
@WebServlet(urlPatterns = "/user")
public class UserServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        UserService userService = new UserServiceImpl();
        // 1请求编码设置
        req.setCharacterEncoding("UTF-8");

        String action = req.getParameter("action");
        // 判断action 来区分是哪种操作
        if ("list".equals(action)){
            // 获取参数
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");

            User condition = new User(name, pass);
            //接受当前页参数 没传是null
            String currentPage = req.getParameter("currentPage");
            if (currentPage == null) {
                currentPage = "1";
            }
            int int_currentPage = Integer.parseInt(currentPage);

            // 创建分页对象
            Page page = new Page();
            page.setCurrentPage(int_currentPage);
            // 查询用户表的记录总数
            int count = userService.count(condition);
            page.setTotalCount(count);
            page.setTotalPage();

            // 计算偏移量
            int pageSize = page.getPageSize();
            int offset = (int_currentPage - 1) * pageSize;

            List<User> users = userService.findAll(condition,offset,pageSize);
            // 把数据放到请求域中
            req.setAttribute("users", users);
            req.setAttribute("condition", condition);
            req.setAttribute("page", page);
            // 在哪个页面显示数据
            req.getRequestDispatcher("/list.jsp").forward(req, resp);
        } else if("delete".equals(action)) {
            // 获取参数
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            int result = userService.deleteUserById(id);
            if (result > 0) {
                // 重定向
                resp.sendRedirect("user?action=list");
            } else {
            }
        } else if("add".equals(action)) {
            // 获取参数
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result = userService.addUser(new User(name,pass));
            if (result > 0) {
                // 重定向
                resp.sendRedirect("user?action=list");
            } else {

            }
        } else if("toupdate".equals(action)) {
            // 获取参数
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            User user = userService.findUserById(id);
            // 把数据放到请求域中
            req.setAttribute("user", user);
            // 在哪个页面显示数据
            req.getRequestDispatcher("/updateUser.jsp").forward(req, resp);
        } else if("update".equals(action)) {
            // 获取参数
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result = userService.updateUser(new User(id,name,pass));
            if (result > 0) {
                // 重定向
                resp.sendRedirect("user?action=list");
            } else {
            }
        }
    }
}
